Eutirox in Spain: Levothyroxine Explained
Medically Reviewed by Dr. Pedro Yelamo Vera, MD
Licensed Physician No. 484814280 · Official Medical College of Bizkaia (Spain)Last reviewed: 3 October 2026
Eutirox is levothyroxine, known elsewhere as Synthroid or Euthyrox. How to take it, why brand switches need a check and what to do in pregnancy.
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Eutirox is levothyroxine, the thyroid hormone replacement known elsewhere as Synthroid or Euthyrox.
- What it is used for: an underactive thyroid, and treatment after thyroid surgery.
- How to take it: on an empty stomach with water before breakfast, and apart from iron, calcium and antacids.
- If you already take it: take it every day and tell the doctor which brand and strength you use at home, because switching brands can need a blood test check.
- Signs of too much: palpitations, feeling jittery, poor sleep, tremor or weight loss.
- Pregnancy: it usually needs adjusting, so seek advice as soon as you know.
- Do you need a prescription? Yes.
This is general information and does not replace the package leaflet or the advice of your doctor or pharmacist. If you need an assessment, you can book a video consultation. This service is for urgent, non-emergency care; in an emergency, call 112.
Medical Citations & Sources
This content is written and reviewed by a licensed physician with reference to the following official health authorities.
